<table height="300">
    <tr>
        
        <td valign="top"><br/><br/><div style="margin-left: 200px;">
                <h2> Mail Sent Successfully .Click to </h2><br/> <input type="button" value="Back" onclick="history.back(-1);" name="back"/>
            </div>
        </td>
        
    </tr>
    
    
</table>